The vapor pressure of a solution is always that of the pure solvent
A) equal to
B) twice
C) one half
D) higher than
E) lower than

Question

Quizplus · Accepted Answer

The vapor pressure of a solution is lower than that of the pure solvent. This is because the presence of solute molecules in the solution reduces the number of solvent molecules at the surface, which in turn reduces the number of solvent molecules that can vaporize and contribute to the vapor pressure.

The Vapor Pressure of a Solution Is Always That of the Pure